Brake for road-vehicles.



'W. H. WEIGHT. BBAK; FOR ROAD vnmcus/ APPLICATION FILED DEO.15, 1909.

Patented Aug. 9, 1910.

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w. H. WEIGHT. BRAKE FOR ROAD VEHICLES.

APPLIQATION FILED 1330.16, 1909.

Patented Aug. 9, 1910.

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Specification 01 Letters Patent. Application alea December 15, 1969. serial no. 533,182

Patented-Aug. 9; 1910.

To all whom it ma concern:

WILLIAM HERBERT WEIGHT, a subject of the King of'England, residing atBishopston, Bristol, in England, have invented certain new and useful Improvements in Brakes for Road-Vehicles, of which the follpwing is a specification.

Thisinvent1on relates to liquid operated brake mechanism for automobiles and like vehicles of the type wherein the brake-blocks are operated by pistons acting like hydraulic rams connected to a common source of fluid pressure, and it consists in improvements in the tubing leadi g to the several cylinders of the said'piston 1n the connections to those of the brakes of the steering wheels, in the main pressure producing device, and in the means of replenishment of -the latter with liquid and the release of air therefrom. In brake mechanism of this type it is essential that the tubular connectlons .between the main pressure producer and the several hydraulic'rams should be capable of withstanding the destructive effect not the vertical movements 'of the road wheelswith respect to. the frame of-the vehicle and the vibrations to which thetubing is subjected. When applied to brakes of steering wheels it is further essential'that the tubmgbe not deram cylinder a'resilient tube of copper or stroyed or fatigued by the deflection of the wheels. 1

In the present invention I employ between the main pressure reducer and the brake steel firmly connected at each end and coiled .orpartly coiled at someplace 'or places in- :termediate of its ends so thatthe pipe as a ..whole has suificient elasticity. to permit of the moveinents of the brake ram cylinder without destruction of the pi e or of its con-' nections. This pipe is so s aped as tolie freely without contact with the frame of the vehicle and is sufficiently rigid to be self supporting, although if desired it may recelve additional support from s ring suspenders or the like. Where the pipe is connected to the ram cylinder on a steerin wheel a swivel joint isplaced in the pipe an alined with the axis'of the steering socket preferably beneath the getter. This joint is of a kind to permit lategal swingiof the. section-of thel'pipe betWeeii'Ei-tand the steerin wheel in order to follow the movements 0 the steering wheel.

In the main pressure cylinder, 1 provide.

a pllnunger which is of less diameter thanthe der in which it works-and when in the oflt' position is clear of the replenishing. pipe. The plunger passes throu h. a cup leather whic is preferably secured between thecylinder and its head or collar-through which the plunger passes. therefore does not act directly to open and The plunger v close 'the port in the cylinder wall through which the cylinder is replenished with liquid to compensate for accidental'leakag'e,

but such port is controlled by a check-valve. This check valve may be free to be operated by the pressure of the liquid, but I prefer to render its action more certain by a mechanical connection controlled by theniovements of the pedal-or lever'by which-the brakes are put in action, For this. purpose I may use a plug-valve or cock or a puppetvalve pressed into closed position bya spring and opened by a plunger connected mecha'nically to an abutment against which the pedal or level aforesaid presses when approaching its position of rest with the brakes off. By this means the port is held open to the replenishment chamber when. the brakes are off and any air that might have been resent in the main res-' I sure cylinder is a owed free'escape an the li 'd free access, whereas when the brakes are to be put 'on, the initial movement-of the pedal or lever permits the spring tosclose the valve and prevents escape of liquidfrom the main pressure cylinder tothe replenishment chamber. illustrated in the annex drawings, in. which These im rovements are Figure 1 is a longitudinal sectional elevation of the chassis of a motor road vehicle showing certain of my improvements applied thereto; Fig. 2 is a plan view of Fig.

l,-and Fig.3 afront end view thereof; Fig. 4 is a sectional detailview on an enlar ed' scale showing the air release or. check'va ve and Fig. 5 is a sectional'deta' view'also'on an enlarged scale showing a swivel joint for asteering wheel. '5. In the saiddrawing's' 1 designates) the frame of'the vehicle and 2 the road wheels vthereof,each'of which is provided with the brake-drum 3 and ini'nriorbrake-mechanism 4 of construction including brake ram cytinders 5. The main pressure pro ducer- 6 is shown as located taglljacent the 1t.-

dash board on which is i the reservoir 8 for pressure liquid in communication with tlfe main pressure cylinder 9 by means -.each 5.

of a 'pi e 10. Between said cylinder 9' and f the brake ram cylinders is interposed atube of copper or steel 11 provided with a coil as at 12. This may be a complete coil as illustrated or only a partial one or'more than one coil may be provided in leadin couple larly lilig. 2.)

each tube in order to still further increase the resiliency'of said tubes. The pipes 11 to the fore or steering wheelsare togethen by a transverse member .13 from which a branch 14 leads to the cylinder 9 and the pipes leading to the rear' wheels aresimilarly connected by'a similar transverse'wmember extending into a connec 'tion'j15 {on the cylinder (see more particu- Thecfonnectwn of the pipes 11 to the steering wheels is effected as shown more particularly in Figs.'3 and- 5,by means of a swivel oint 16 disposed in axial alinement withthe steering socket 17 immediatel beflared and beveled at the top, as at 22 and bears u on a similarly beveled portion of the bus g 20. A lock nut 23, is provided on'the exterior of said bushing and the outer portion thereof is faced for reception of aa wrench for adjusting purposes.

" Referring now more particularly to Fig.

1 the main pressure cyllnder 9 contains the plunger 23 of less diameter than saidcylinder. The said plun er. passes through the cup-leather 24 and cy der head 25 and is connected tothe foot brake lever 26 by means of a link 27. 28 shows the port in the cylinder into which the connection '10 from the reservoir 8 leads, and in said connection is interposed the check valve 29 previously referre to and a form of which 1s illustrated in detail in Fig. 4, from which :it will be seen that said valve comprises the casing 30 provided with two liquid channels 31 and 32 adapted tobe placed into or out of communication by means of the valve body 33 normally held closed against its seat by a helical sprnig 34 and carried b 'arod 35 extending through a gland or'st box 36 and bearing against a double-armed ever 37 38 connected to the brake lever 26. It thus be seen that .when the brakes are off as in the position of the parts shown in Fig. 1 the valve will be open and allow liqugdi toenter the cylinder-9-whereas when the ever is-n oved forward to apply the brakes the valve will be closed and thus cut off communication between said cylinder and the reseryoir 8.

I do not limit myself to the exact construction and arrangement of parts herein- I '1. In a hydraulic brake s stem for road vehicles the combination wit a brake ram cylinder carried by steering wheel of a vehicle, and a main pressure device, of a resilient tube connected at opposite ends to sand cylinder and pressure device and a swivel joint inter os'ed in the length of said tubing and alin with'the pivotal axis of thesteerin' wheel.

2. In a ydraulic brake system for road vehicles the combination with a brake ram cylinder carried by. eachv of the vehicle wheels and a main pressure device 'sup orted by the vehicle, of resilient tubes eac connected at opposite ends to abrake rarn cylinder and to the main pressure device, a swivel joint interposed in each of said tubes which communicate with the ram cylinders of the steering wheels, said joint being alined with the pivotal axis of the steering wheel, and all the aforesaid tubes'bein partially coiled and so disposed-as to avoi contact vgh the vehicle framing.

3.- vehic s, the combination with a brake ram cylinder carried by a vehicle wheel of a main pressure device including a cylinder, a plunger therein. of less diameter than said cylinder and a cup leather at one end of said cylinder in which said plunger slides and a connection from said ram cylinder to saidpressure device.

4. In a hydraulic brake s stem for road vehicles the combination 0 a brake ram cylinder carried by a vehicle wheel, a main pressure device including a cylinder,-a

plunger therein of less diameter than said cylinderand a cup leather at one end of, said cylinder in which said plunger slides, and a resilient tube connected at opposite ends to said ramcylinder and ressure device, said tube being partially coiled and so disposed {ter to the cylinder, a valve in said connection, a plunger operating member and connections between the latter and the valve a hydraulic bra/kesystem for road,

whereby said valve is held open when the operating member is in its off position and closed during the initial movement of the latter from said position.

6. In a hydraulic brake system for road vehicles, the combination of a brake ram cylinder carried by each of the 'vehicle wheels a main pressure device including a cylinder supported by the vehicle, resilient tubes each connected at opposite ends to a brake ram cylinder and to said pressure device, said tubes being partially coiled and so disposed as to avoid contact with the vehicle framingya plunger Working in the pressure cylinder, a liquid reservoir, a connection from the latter to the cylinder, a

valve in said connection, a plunger operating member and connections between the latter and the valve whereby said valve is held open when the operating member is in its off position and closed during the initial movement of the latter from said position.

In witness whereof I have signed this specification in the presence of two witnesses. 25

WILLIAM HERBERT WEIGHT.

Witnesses:

W. M. Pmu'r, FREDK. N. Jones. 

